A flight management system with core and supplementary modules is proposed. The core module may include generic applications that implement generic functionalities related to a flight management of the aircraft. The supplementary module may include supplementary applications that implement supplementary functionalities specific to an entity to which the aircraft belongs. The supplementary module may be divided into principal and auxiliary partitions (or entities), and the supplementary applications, also referred to as principal applications, may be implemented in the principal partition. One or more auxiliary applications may be implemented in the auxiliary partition. Each auxiliary application may be associated with one or more principal applications such that the execution of the principal application requires the associated auxiliary application to be executed.